Simple fix for the scd 777es "no disc" message?

My scd 777es has begun to display a "no disc" error message (yes there is a disc there). Sometimes it will play upon start over but more often it does not. I seem to recall a previous audiogon message or two about this, but cannot find them.

The thought of shipping the unit to Sony is not pleasant. Is there a simple home-fix for this? Any help would be appreciated.